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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [Minimal/] [integer.c] - Blame information for rev 606

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1 606 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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    ***************************************************************************
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    *                                                                         *
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    * If you are:                                                             *
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    *                                                                         *
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    *    + New to FreeRTOS,                                                   *
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    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
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    *    + Looking for basic training,                                        *
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    *    + Wanting to improve your FreeRTOS skills and productivity           *
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    *                                                                         *
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    * then take a look at the FreeRTOS books - available as PDF or paperback  *
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    *                                                                         *
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    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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    *                  http://www.FreeRTOS.org/Documentation                  *
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    *                                                                         *
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    * A pdf reference manual is also available.  Both are usually delivered   *
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    * to your inbox within 20 minutes to two hours when purchased between 8am *
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    * and 8pm GMT (although please allow up to 24 hours in case of            *
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    * exceptional circumstances).  Thank you for your support!                *
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    *                                                                         *
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    ***************************************************************************
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    This file is part of the FreeRTOS distribution.
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    FreeRTOS is free software; you can redistribute it and/or modify it under
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    the terms of the GNU General Public License (version 2) as published by the
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    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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    ***NOTE*** The exception to the GPL is included to allow you to distribute
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    a combined work that includes FreeRTOS without being obliged to provide the
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    source code for proprietary components outside of the FreeRTOS kernel.
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    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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    more details. You should have received a copy of the GNU General Public
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    License and the FreeRTOS license exception along with FreeRTOS; if not it
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    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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    by writing to Richard Barry, contact details for whom are available on the
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    FreeRTOS WEB site.
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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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    http://www.SafeRTOS.com - A version that is certified for use in safety
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    critical systems.
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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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/*
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 * This version of integer. c is for use on systems that have limited stack
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 * space and no display facilities.  The complete version can be found in
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 * the Demo/Common/Full directory.
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 *
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 * As with the full version, the tasks created in this file are a good test
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 * of the scheduler context switch mechanism.  The processor has to access
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 * 32bit variables in two or four chunks (depending on the processor).  The low
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 * priority of these tasks means there is a high probability that a context
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 * switch will occur mid calculation.  See flop. c documentation for
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 * more information.
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 *
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 */
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/*
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Changes from V1.2.1
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        + The constants used in the calculations are larger to ensure the
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          optimiser does not truncate them to 16 bits.
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Changes from V1.2.3
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        + uxTaskCheck is now just used as a boolean.  Instead of incrementing
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          the variable each cycle of the task, the variable is simply set to
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          true.  sAreIntegerMathsTaskStillRunning() sets it back to false and
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          expects it to have been set back to true by the time it is called
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          again.
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        + A division has been included in the calculation.
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*/
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* Demo program include files. */
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#include "integer.h"
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/* The constants used in the calculation. */
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#define intgCONST1                              ( ( long ) 123 )
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#define intgCONST2                              ( ( long ) 234567 )
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#define intgCONST3                              ( ( long ) -3 )
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#define intgCONST4                              ( ( long ) 7 )
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#define intgEXPECTED_ANSWER             ( ( ( intgCONST1 + intgCONST2 ) * intgCONST3 ) / intgCONST4 )
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#define intgSTACK_SIZE                  configMINIMAL_STACK_SIZE
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/* As this is the minimal version, we will only create one task. */
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#define intgNUMBER_OF_TASKS             ( 1 )
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/* The task function.  Repeatedly performs a 32 bit calculation, checking the
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result against the expected result.  If the result is incorrect then the
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context switch must have caused some corruption. */
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static portTASK_FUNCTION_PROTO( vCompeteingIntMathTask, pvParameters );
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/* Variables that are set to true within the calculation task to indicate
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that the task is still executing.  The check task sets the variable back to
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false, flagging an error if the variable is still false the next time it
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is called. */
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static volatile signed portBASE_TYPE xTaskCheck[ intgNUMBER_OF_TASKS ] = { ( signed portBASE_TYPE ) pdFALSE };
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/*-----------------------------------------------------------*/
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void vStartIntegerMathTasks( unsigned portBASE_TYPE uxPriority )
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{
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short sTask;
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        for( sTask = 0; sTask < intgNUMBER_OF_TASKS; sTask++ )
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        {
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                xTaskCreate( vCompeteingIntMathTask, ( signed char * ) "IntMath", intgSTACK_SIZE, ( void * ) &( xTaskCheck[ sTask ] ), uxPriority, ( xTaskHandle * ) NULL );
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        }
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vCompeteingIntMathTask, pvParameters )
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{
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/* These variables are all effectively set to constants so they are volatile to
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ensure the compiler does not just get rid of them. */
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volatile long lValue;
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short sError = pdFALSE;
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volatile signed portBASE_TYPE *pxTaskHasExecuted;
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        /* Set a pointer to the variable we are going to set to true each
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        iteration.  This is also a good test of the parameter passing mechanism
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        within each port. */
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        pxTaskHasExecuted = ( volatile signed portBASE_TYPE * ) pvParameters;
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        /* Keep performing a calculation and checking the result against a constant. */
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        for( ;; )
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        {
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                /* Perform the calculation.  This will store partial value in
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                registers, resulting in a good test of the context switch mechanism. */
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                lValue = intgCONST1;
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                lValue += intgCONST2;
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                /* Yield in case cooperative scheduling is being used. */
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                #if configUSE_PREEMPTION == 0
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                {
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                        taskYIELD();
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                }
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                #endif
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                /* Finish off the calculation. */
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                lValue *= intgCONST3;
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                lValue /= intgCONST4;
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                /* If the calculation is found to be incorrect we stop setting the
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                TaskHasExecuted variable so the check task can see an error has
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                occurred. */
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                if( lValue != intgEXPECTED_ANSWER ) /*lint !e774 volatile used to prevent this being optimised out. */
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                {
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                        sError = pdTRUE;
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                }
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                if( sError == pdFALSE )
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                {
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                        /* We have not encountered any errors, so set the flag that show
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                        we are still executing.  This will be periodically cleared by
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                        the check task. */
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                        portENTER_CRITICAL();
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                                *pxTaskHasExecuted = pdTRUE;
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                        portEXIT_CRITICAL();
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                }
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                /* Yield in case cooperative scheduling is being used. */
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                #if configUSE_PREEMPTION == 0
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                {
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                        taskYIELD();
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                }
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                #endif
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        }
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}
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/*-----------------------------------------------------------*/
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/* This is called to check that all the created tasks are still running. */
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portBASE_TYPE xAreIntegerMathsTaskStillRunning( void )
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{
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portBASE_TYPE xReturn = pdTRUE;
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short sTask;
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        /* Check the maths tasks are still running by ensuring their check variables
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        are still being set to true. */
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        for( sTask = 0; sTask < intgNUMBER_OF_TASKS; sTask++ )
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        {
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                if( xTaskCheck[ sTask ] == pdFALSE )
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                {
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                        /* The check has not incremented so an error exists. */
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                        xReturn = pdFALSE;
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                }
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                /* Reset the check variable so we can tell if it has been set by
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                the next time around. */
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                xTaskCheck[ sTask ] = pdFALSE;
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        }
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        return xReturn;
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}
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